Question

is a binary operation which is not commutative.

• A. Addition
• B. Subtraction
• C. Multiplication

Answer 1

The correct option is B Subtraction

For a binary operation ${}^{\ast }$ to be commutative, we need a ${}^{\ast }b=b^{\ast }$ a for all a and b.

For multiplication and addition, this is true because ab = ba and a+b = b+a. But, a – b is not equal to b – a for all a and b. So, subtraction is not commutative.